CN116768560A - High-strength corrosion-resistant marine large-volume concrete and preparation method thereof - Google Patents
High-strength corrosion-resistant marine large-volume concrete and preparation method thereof Download PDFInfo
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- CN116768560A CN116768560A CN202310352744.9A CN202310352744A CN116768560A CN 116768560 A CN116768560 A CN 116768560A CN 202310352744 A CN202310352744 A CN 202310352744A CN 116768560 A CN116768560 A CN 116768560A
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- 239000011372 high-strength concrete Substances 0.000 description 4
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- XDLMVUHYZWKMMD-UHFFFAOYSA-N 3-trimethoxysilylpropyl 2-methylprop-2-enoate Chemical compound CO[Si](OC)(OC)CCCOC(=O)C(C)=C XDLMVUHYZWKMMD-UHFFFAOYSA-N 0.000 description 3
- UHOVQNZJYSORNB-UHFFFAOYSA-N Benzene Chemical compound C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 description 3
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- WYTZZXDRDKSJID-UHFFFAOYSA-N (3-aminopropyl)triethoxysilane Chemical compound CCO[Si](OCC)(OCC)CCCN WYTZZXDRDKSJID-UHFFFAOYSA-N 0.000 description 2
- 230000032683 aging Effects 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
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- FPYJFEHAWHCUMM-UHFFFAOYSA-N maleic anhydride Chemical compound O=C1OC(=O)C=C1 FPYJFEHAWHCUMM-UHFFFAOYSA-N 0.000 description 2
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- 239000008029 phthalate plasticizer Substances 0.000 description 1
- XNGIFLGASWRNHJ-UHFFFAOYSA-L phthalate(2-) Chemical compound [O-]C(=O)C1=CC=CC=C1C([O-])=O XNGIFLGASWRNHJ-UHFFFAOYSA-L 0.000 description 1
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- BPSIOYPQMFLKFR-UHFFFAOYSA-N trimethoxy-[3-(oxiran-2-ylmethoxy)propyl]silane Chemical compound CO[Si](OC)(OC)CCCOCC1CO1 BPSIOYPQMFLKFR-UHFFFAOYSA-N 0.000 description 1
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Classifications
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/04—Portland cements
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/20—Resistance against chemical, physical or biological attack
- C04B2111/24—Sea water resistance
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
- C04B2201/52—High compression strength concretes, i.e. with a compression strength higher than about 55 N/mm2, e.g. reactive powder concrete [RPC]
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention discloses a high-strength corrosion-resistant marine large-volume concrete, which comprises the following components with the mixing amount of 0.5-50 kg/m 3 Temperature shrinkage induced cracking resistant fiber and 50-800 kg/m 3 Pre-wet internal curing aggregate; the shrinkage rate of the thermal shrinkage induction type anti-cracking fiber is more than or equal to 0.5%, the thermal excitation shrinkage temperature is 30-100 ℃, and the thermal shrinkage type anti-cracking fiber comprises a thermal shrinkage composite fiber composed of a thermal shrinkage core material and an outer thermal shrinkage skin material, and a water-soluble modified polyvinyl alcohol layer further coated on the surface of the thermal shrinkage composite fiber; wherein the water-soluble modified polyvinyl alcohol layer contains polyvinyl alcohol and an expansion component. According to the invention, the thermal shrinkage induction type anti-cracking fiber with the shrinkage compensation function and the internal curing aggregate with the high-fine communication hole structure are simultaneously introduced into the high-strength marine large-volume concrete with the carbon number more than 50, the microstructure of the thermal shrinkage induction type anti-cracking fiber is cooperatively regulated and controlled, the mechanical property, the anti-cracking property and the chlorine salt corrosion resistance of the thermal shrinkage induction type anti-cracking fiber are improved, and the technical problems of crack control, chlorine salt corrosion resistance and the like of the high-strength marine large-volume concrete are effectively solved。
Description
Technical Field
The invention belongs to the technical field of building materials, and particularly relates to high Jiang Hai engineering large-volume concrete and a preparation method thereof.
Background
Along with the promotion of the development planning of the large-span cross-sea bridge engineering, the key structural parts need to be applied with high-strength marine large-volume concrete (such as C55 bridge pier columns and tower column solid sections, C60-C70 continuous rigid frame prestressed box girders, C80 arch bridge main arch rings, C100 steel-concrete combined sections and the like) with the size of more than 50 except for the application of the marine large-volume concrete with the low strength grade in C30-C45, and the application is more and more wide. Aiming at the large-volume concrete of the marine engineering of the C30-C50 bridge with wider application at present, the optimization measures of low-heat cement or cement consumption reduction, large-doping amount of mineral admixture, retarder doping and other mixing proportion are generally adopted, shrinkage-reducing agents, expanding agents or hydration heat inhibitors and other crack control functional materials are doped, the mold entering temperature is reduced, and isothermal control measures of cooling water pipes are arranged, so that a better crack control effect is exerted. However, as the strength grade of the concrete is improved to be more than C50, the cracking control difficulty is increased; once the marine large-volume concrete is cracked, chloride ions in the seawater are very easy to permeate into the steel bars through the cracks, so that the steel bars are corroded, the concrete is expanded, cracked and peeled off and the structure is damaged, the bearing capacity and durability of the concrete structure are affected, the normal operation of the bridge structure is endangered, and the large-scale construction of long-span cross-sea bridges is restricted due to the fact that the potential safety hazard and the high repair and maintenance cost are brought.
The research shows that the introduction of fiber and internal curing material into marine mass concrete is two effective means for improving the cracking resistance. Polypropylene fiber and steel fiber are added into mass concrete at the earliest foreign countries to improve the crack resistance, and the polypropylene fiber has lower modulus, poor dispersibility when the mixing amount is large and influences the pumping construction performance of the concrete. However, common steel fibers have a risk of rusting in ocean engineering, and at the same time, the engineering construction cost is increased. In addition, the commonly used fibers and concrete adopted at present are thermal expansion and cold shrinkage materials; taking steel fiber as an example, the thermal expansion coefficient of the steel fiber is larger than that of concrete, in the temperature rising stage of the mass concrete, the interface gelled slurry is pulled easily due to the fact that the thermal expansion of the steel fiber and the gelled slurry in the concrete are inconsistent, microscopic cracks are generated at the interface, and the shrinkage of the fiber in the temperature lowering stage further promotes the development of the cracks.
The shrinkage of concrete can be reduced by incorporating the internal curing material, and the internal curing material commonly used for concrete at present is light aggregate and super absorbent resin (SAP); SAP has better desorption capacity than lightweight aggregate. However, when SAP releases moisture, voids remain in the dense cement matrix, thereby reducing the mechanical properties and durability of the concrete, making it unsuitable for high-strength marine bulk concrete. The ordinary lightweight aggregate can reduce the mechanical property of concrete, and meanwhile, the water release mechanism of the lightweight aggregate in the temperature rise and fall stage of the mass concrete is closely related to the pore structure and the external temperature and humidity of the mass concrete, in the temperature rise process of the mass concrete of a high-strength sea worker, the temperature rise rate is higher, the internal highest temperature can reach 70-90 ℃, the lightweight aggregate can rapidly release water at high temperature, on one hand, the porosity of the gelled slurry around the lightweight aggregate is increased and increased, and on the other hand, the water release of the lightweight aggregate in the temperature fall process of the mass concrete is relatively reduced, so that the internal curing effect of the lightweight aggregate is reduced.
Disclosure of Invention
The invention mainly aims to provide high-strength corrosion-resistant marine large-volume concrete, aiming at the problems and defects existing in the prior art, and simultaneously introduces thermally-excited shrinkage fibers and internal curing aggregates with a high-fine communication hole structure into the high-strength marine large-volume concrete with the carbon number of more than 50, so as to cooperatively regulate and control the microstructure and improve the cracking resistance and the chlorine salt corrosion resistance of the high-strength marine large-volume concrete, and effectively solve the technical problems of cracking control, chlorine salt corrosion resistance and the like of the high-strength marine large-volume concrete.
In order to achieve the above purpose, the invention adopts the following technical scheme:
a high Jiang Hai work mass concrete comprises the following components with the mixing amount of 0.5-50 kg/m 3 Heat-activated shrinkage fiber of 50-800 kg/m 3 Pre-wet internal curing aggregate; the shrinkage rate of the heat-activated shrinkage type fiber is more than or equal to 0.5 percent, and the shrinkage temperature is 30-100 ℃.
In the scheme, the thermal shrinkage induction type anti-cracking fiber comprises thermal shrinkage composite fiber composed of a thermal shrinkage core material and an outer thermal shrinkage skin material, and a water-soluble modified polyvinyl alcohol layer further coated on the surface of the thermal shrinkage composite fiber; wherein the water-soluble modified polyvinyl alcohol layer contains polyvinyl alcohol and an expansion component.
In the scheme, the main raw materials of the heat-shrinkable core material are one or more of polyester, polypropylene and polyamide, wherein the molecular weight of the polyester is 2 ten thousand to 3 ten thousand, the molecular weight of the polypropylene is 6000 to 8000, the molecular weight of the nylon is 2 ten thousand to 3 ten thousand, the shrinkage rate is 5 to 15 percent, the response temperature is 40 to 100 ℃, the tensile strength is 300 to 500MPa, and the elastic modulus is 3 to 12GPa; the main raw materials of the heat-shrinkable leather are one or more of polyvinyl alcohol, ultra-high modulus polyethylene and polyformaldehyde, wherein the molecular weight of the polyvinyl alcohol is 17 ten thousand to 22 ten thousand, the molecular weight of the polyethylene is 100 ten thousand to 200 ten thousand, the molecular weight of the polyformaldehyde is 2 ten thousand to 3 ten thousand, the tensile strength is 500 to 1200MPa, and the elastic modulus is 7 to 35GPa; the shrinkage rate is 0.5-2%, the response temperature is 30-100 ℃, the strength is 500-1200 MPa, the elastic modulus is 7-35 GPa, and the shrinkage rate is 0.5-2%.
In the scheme, the raw materials of the heat-shrinkable core material also comprise stiffening nucleating agent, and the content (accounting for the total raw material mass, the following is the same) of the stiffening nucleating agent is 1-5 wt%; the raw materials of the heat-shrinkable leather also comprise a plasticizer and a compatilizer, wherein the content of the plasticizer (accounting for the total mass of the raw materials) is 1-5 wt%, and the content of the compatilizer is 1-3 wt%.
In the scheme, the compatilizer comprises more than one of maleic anhydride grafting compatilizer and imide modified polypropylene resin; the plasticizer comprises more than one of phthalate, aliphatic dibasic acid ester, fatty acid ester, benzene polyacid ester, polyol ester, epoxy hydrocarbon and alkyl sulfonate.
In the scheme, the stiffening nucleating agent comprises more than one of dibenzylidene sorbitol, aluminum aromatic carboxylic acid aluminum and sodium benzoate.
In the scheme, the thermal shrinkage induction type anti-cracking fiber is obtained by carrying out surface modification on the thermal shrinkage composite fiber by adopting a silicon solution or a silane coupling agent solution, drying and then carrying out surface indentation, then adding the thermal shrinkage composite fiber into a modified polyvinyl alcohol solution added with an expansion component for coating modification, taking out and drying.
In the scheme, the modified polyvinyl alcohol solution consists of a polyvinyl alcohol solution and a liquid expanding agent; the liquid expanding agent mainly comprises an expanding component, a shrinkage reducing component, a stable dispersing component and water.
In the above embodiment, the concentration of the polyvinyl alcohol solution (aqueous solution) is 4 to 10wt% and the viscosity is 20.5 to 24.5 Pa.s.
In the above scheme, each component and the dosage thereof in the liquid expanding agent comprise: 60-150 parts of expansion component, 20-60 parts of shrinkage reducing component, 10-70 parts of stable dispersion component and 600-1000 parts of water.
In the scheme, the expansion component is formed by compounding anhydrous aluminum sulfate and gypsum, wherein the mass ratio of the anhydrous aluminum sulfate to the gypsum is 1 (0.66-1.5); the shrinkage reducing component is one or more of amphiphilic diethylene glycol monobutyl ether and dipropylene glycol; the stable dispersion component is cationic polyacrylamide.
In the scheme, the mass ratio of the polyvinyl alcohol solution to the liquid expanding agent is 1 (0.4-0.9).
In the above scheme, the specific preparation steps of the thermal shrinkage induction type anti-cracking fiber comprise:
1) Extruding a heat-shrinkable core material and a heat-shrinkable sheath material into a die head with two cavities respectively by adopting two extruders, wherein the heat-shrinkable sheath material enters the cavity corresponding to the sheath material, the heat-shrinkable core material enters the cavity corresponding to the core material, the materials in the two cavities are converged at the position of a spinneret plate of the extruder, wherein the spinneret plate is provided with an inner ring and an outer ring, the inner ring of the spinneret plate is connected with the cavity of the core material, the outer ring of the spinneret plate is connected with the cavity of the sheath material, the two materials in a molten state are extruded (melt extruded) through the spinneret plate, and are adhered together in air, cooled by a cold water tank, and then drawn in hot water at 90-100 ℃ to form the composite fiber with a sheath-core structure;
2) Adding the composite fiber obtained in the step 1) into a silicon solution or a silane coupling agent solution for modification, and drying and then surface indentation to increase the bonding performance with concrete slurry;
3) And (3) adding the composite fiber obtained in the step (2) into a modified polyvinyl alcohol solution added with an expansion component for coating modification, taking out and drying to obtain the thermal shrinkage induction type anti-cracking fiber.
In the scheme, the coating modification temperature is room temperature and the standing time is 10-24 hours.
In the above scheme, the silane coupling agent can be selected from gamma-aminopropyl triethoxysilane (KH 550), gamma- (2, 3-epoxypropoxy) propyl trimethoxysilane (KH-560), gamma- (beta-aminoethyl) aminopropyl trimethoxysilane (KH 792), gamma-methacryloxypropyl trimethoxysilane (KH 570) or a mixture thereof; the silane coupling agent can serve to link the organic polymer with the hydration product.
Preferably, the silane coupling agent consists of gamma-aminopropyl triethoxysilane, gamma- (beta-aminoethyl) aminopropyl trimethoxysilane and gamma-methacryloxypropyl trimethoxysilane.
In the scheme, the solvent adopted by the silane coupling agent solution is alcohol water solution (the concentration of ethanol is 80-95 vol%) and the concentration of the silane coupling agent is 0.1-10 wt%.
In the above scheme, the organic silicone oil is amino silicone oil or dimethyl silicone oil (such as 201 dimethyl silicone oil sold in market) with concentration of more than 90%.
In the scheme, the adopted modification condition is that the mixture is kept stand for 1 to 2 hours at room temperature.
In the above scheme, the preparation method of the thermal shrinkage induction type anti-cracking fiber comprises the following steps:
1) Extruding a heat-shrinkable core material mixture and a heat-shrinkable sheath material mixture into a die head with two cavities respectively by adopting two extruders, wherein the heat-shrinkable sheath material enters the cavity corresponding to the sheath material, the heat-shrinkable core material enters the cavity corresponding to the core material, the materials in the two cavities are converged at the position of a spinneret plate of the extruder, wherein the spinneret plate is provided with an inner ring and an outer ring, the inner ring of the spinneret plate is connected with the cavity of the core material, the outer ring of the spinneret plate is connected with the cavity of the sheath material, the two materials in a molten state are extruded (melt extruded) through the spinneret plate and are adhered together in air, cooling is carried out through a cold water tank, and then drawing is carried out in hot water at 90-100 ℃ to form the composite fiber with the sheath-core structure;
2) Adding the composite fiber obtained in the step 1) into a silicon solution or a silane coupling agent solution for modification, and drying and then surface indentation to increase the bonding performance with concrete slurry;
3) And (3) adding the composite fiber obtained in the step (2) into a modified polyvinyl alcohol solution added with an expansion component for coating modification, taking out and drying to obtain the thermal shrinkage induction type anti-cracking fiber.
In the scheme, the melting temperature adopted by the heat shrinkage core material mixture corresponding to the cavity is 200-280 ℃; the extrusion pressure is 7-10 MPa.
In the scheme, the melting temperature adopted by the corresponding cavity of the heat-shrinkable leather material mixture is 150-220 ℃; the extrusion pressure is 3-10 MP.
In the scheme, in the final extrusion section corresponding to the spinneret plate, the melting temperature of the mixture in two molten states is regulated to be 200-220 ℃, and the extrusion pressure is 3-10 MPa.
In the scheme, the shrinkage temperature of the thermal shrinkage induction type anti-cracking fiber is 30-100 ℃, the compressive strength is greater than 800MPa, the elastic modulus is greater than 10Gpa, the interfacial shrinkage stress with cement paste is greater than 30MPa, and the creep coefficient is less than 0.5.
Further, the diameter of the core in the thermal shrinkage induction type anti-cracking fiber is 0.01-0.15 mm, the thickness of the sheath material is 0.01-0.1 mm, the length is 6-25 mm, and the thickness of the water-soluble modified polyvinyl alcohol layer is 0.01-0.02 mm.
In the scheme, the particle size of the pre-wet internal curing aggregate is 0-10 mm, and the apparent density is lower than 1.35 g.cm -3 The water absorption is more than 10%, the aperture ratio is more than 30%, the compressive strength is more than 45.0MPa, the cylinder pressure is more than 6.0MPa, and the micro-communicated pores with the size of 0.01-100 nm account for more than 50% of the total porosity.
In the scheme, the preparation method of the internal curing aggregate comprises the following steps of:
1) The ingredients (accurate to 0.01 g) are weighed according to the formula, and the components and the weight parts thereof are as follows: 40-50 parts of phosphogypsum, 5-10 parts of sodium hydroxide, 10-20 parts of fly ash, 10-20 parts of mineral powder and 5-10 parts of cement clinker;
2) And (3) uniformly mixing the weighed raw materials by adopting a dry ball mill, sieving with a 300-mesh sieve to obtain mixed powder, adding water accounting for 10-15wt% of the mixed powder, granulating, aging, drying, firing at 1200-1300 ℃ to obtain the internal curing lightweight aggregate, and sieving the fired lightweight aggregate to obtain the particle size for use.
In the scheme, the adopted firing schedule is specifically as follows: firstly, heating to 890-910 ℃ at a speed of 4-5 ℃/min, wherein the temperature is kept at 190-210 ℃, 390-410 ℃, 590-610 ℃ and 790-810 for 0.5-0.6 h respectively, then heating to the final firing temperature at a speed of 3-4 ℃/min (lower than the heating rate of the first step) for 1.5-2.5 h, and finally cooling to room temperature at a speed of 8-10 ℃/min.
Further, in the high-strength marine large-volume concrete based on the temperature shrinkage induction type anti-cracking fiber and the internal curing aggregate, each component and the content thereof comprise: 250-450 kg/m of cement 3 50-150 kg/m of fly ash 3 50-150 kg/m of mineral powder 3 Silica fume 0-150 kg/m 3 Sand 300-1000 kg/m 3 800-1200 kg/m of crushed stone 3 140-160 kg/m of water 3 4-10 kg/m of additive 3 Temperature shrinkage induction type crack resistant fiber 0.5-50 kg/m 3 50-800 kg/m of pre-wet internal curing aggregate 3 。
In the scheme, the additive is a polycarboxylic acid high-performance water reducer, the water reducing rate is 20-30%, and the shrinkage ratio is not more than 100%.
Preferably, in the severe chlorine salt erosion environment, the high-strength marine large-volume concrete can further modify the hydrophilic micro-internal curing type fiber, and the mixing amount of the hydrophilic micro-internal curing type fiber is 0.1-5 kg/m 3 。
In the scheme, the modified hydrophilic micro-internal curing type fiber is obtained by adding the hydrophilic micro-internal curing type fiber into the concrete anti-corrosion inhibitor for soaking treatment and drying.
In the scheme, the adsorption quantity of the concrete anti-corrosion inhibitor in the modified hydrophilic micro-internal curing type fiber is 1-30 kg/m 3 。
In the scheme, the hydrophilic micro-internal maintenance type fiber can be submicron cellulose fiber, lignin fiber or the like, the diameter of the hydrophilic micro-internal maintenance type fiber is 100 nm-1.0 mu m, and the length of the hydrophilic micro-internal maintenance type fiber is 6-20 mm.
In the scheme, the concrete anti-corrosion inhibitor is a type II concrete anti-corrosion inhibitor, contains hydrophobic groups and can be matched with Ca in a concrete hole solution 2+ Complexing to form a polymer compound which is difficult to be dissolved in water and is blocked in capillary holes by a crystallization product; hydrophilic end of hydrophilic group contained and Ca in pore solution 2+ Complexing to form water-insoluble and salt solution-insoluble crystals, blocking capillary pores, compacting the structure of the gelled slurry, enhancing the hydrophobicity of the slurry at the hydrophobic end, and inhibiting the transmission of chloride ions in the gelled slurry. .
The preparation method of the high-strength marine large-volume concrete based on the temperature shrinkage induction type anti-cracking fiber and the internal curing aggregate comprises the following steps:
1) Weighing the raw materials according to the proportion of the concrete; the concrete raw materials comprise cementing materials, sand and stone aggregates, internal maintenance aggregates, additives, thermal shrinkage induction type anti-cracking fibers and water;
2) Soaking the internal curing aggregate in water until the internal curing aggregate is saturated with water to obtain a saturated water pre-wet internal curing aggregate, adding the pre-wet internal curing aggregate, sizing materials (cement, fly ash, mineral powder and silica fume) and sand stone aggregates (sand and crushed stone) into a concrete mixer, pre-mixing uniformly, pouring water and an additive, stirring uniformly, and uniformly adding temperature shrinkage induction type anti-cracking fibers, and stirring uniformly;
3) And (3) after the obtained mixture is subjected to die filling, vibration and molding, covering a waterproof film on the surface, performing film curing, removing the die, and performing standard curing or heating curing to obtain the high-strength marine large-volume concrete.
In the scheme, the standard curing temperature standard is 20+/-2 ℃ and the relative humidity standard is more than 95%.
In the above scheme, the heating curing temperature is 40-90 ℃.
Further, the heating curing adopts a hot water or steam curing process, the adopted heating rate is 10-15 ℃/h, the constant temperature curing temperature is 40-90 ℃, the time is 12-48 h, and the cooling rate is 10-15 ℃/h.
The 28d compressive strength of the high-strength marine large-volume concrete prepared according to the scheme can reach 60-100 MPa; the 28d splitting tensile strength can reach 6-12 MPa; a shrinkage rate of 28d of 200 micro-strain or less; 28d the electric flux is below 500 ℃; the diffusion coefficient of 28d chloride ions is less than 3.0 x 10 -12 m 2 And/s, the cracking resistance grade of the concrete reaches V grade.
The principle of the invention is as follows:
according to the invention, the thermal shrinkage induction type anti-cracking fiber with the shrinkage compensation function and the curing aggregate in the Gao Weixi communication holes are simultaneously introduced into the high-strength marine large-volume concrete with the carbon number more than 50, the microstructure of the thermal shrinkage induction type anti-cracking fiber is cooperatively regulated and controlled, the anti-cracking performance and the anti-chlorine salt corrosion performance of the thermal shrinkage induction type anti-cracking fiber are improved, and the technical problems of cracking control, chlorine salt corrosion resistance and the like of the high-strength marine large-volume concrete can be effectively solved:
1) The cracking resistance of the concrete is cooperatively improved; the thermal excitation shrinkage effect of the thermal shrinkage induction type anti-cracking fiber with high modulus and the shrinkage compensation function and the bonding coupling effect of the thermal shrinkage induction type anti-cracking fiber and the interface of the cementing slurry are utilized to apply three-dimensional micro-pre-compression stress to the concrete, so that the tensile strength and toughness of the concrete are improved, and the mechanical property of the arch shell structure of the interface of the internal curing aggregate and the cementing slurry is improved; simultaneously, the in-situ compensation shrinkage performance of the expanding agent is combined, so that the fiber reinforced toughness and crack resistance of the mass concrete can be effectively improved; the shrinkage of the concrete is restrained by the internal curing aggregate, and the loss of micro-pre-compression stress caused by shrinkage and creep of the concrete is reduced; the interface between the internal curing aggregate and the cementing slurry forms an arch shell structure to disperse internal stress; the heat insulation and preservation effect of the porous internal curing aggregate can reduce the temperature difference of the internal surface of the concrete, further improve the cracking resistance and the like;
2) And the chlorine salt corrosion resistance of the concrete is synergistically improved: the three-dimensional micro-pre-compression stress applied by the thermal shrinkage induction type anti-cracking fiber is utilized to improve the original defect of the gelled slurry; the interface between the internal curing aggregate and the cementing slurry forms an arch shell structure, so that the interface microstructure of the internal curing aggregate is improved; simultaneously, the interfacial microstructure of the fiber, the concrete aggregate and the internal curing aggregate and the gelled slurry is improved by utilizing the cooperation of the three-dimensional micro-prestress and the internal curing;
in addition, aiming at the severe chloride corrosion environment, hydrophilic micro-internal curing fibers for absorbing concrete corrosion inhibitors are further introduced, the introduced hydrophilic micro-internal curing fibers (submicron cellulose fibers) have an internal curing effect on the high-strength marine large-volume concrete gel slurry, the microstructure of the slurry can be regulated and controlled to enable the dispersion and transfer of internal stress of the slurry to induce and regulate the microstructure of the gel slurry, the crack resistance of the high-strength marine large-volume concrete is enhanced from micro-scale toughening, the crack resistance of the high-strength marine large-volume concrete is mixed with the surface modified thermal shrinkage induction type crack resistance fibers, and the crack resistance of the high-strength marine large-volume concrete can be further enhanced from micro-fine-macro multi-scale in a synergistic manner; the introduced concrete anti-erosion inhibitor contains hydrophilic and hydrophobic groups, hydrophilic ends and Ca in a pore solution 2+ Complexing to form water-insoluble and salt solution-insoluble crystal, blocking capillary pores, compacting the gel slurry structure, reducing the shrinkage of concrete, and on the other hand, spherical superfine communication pore high-strength internal curing aggregate and hydrophilic micro internal curing fiber can counteract the self shrinkage of concrete anti-corrosion inhibitor to high-strength and high-volume concreteIs a negative effect of (2); the hydrophobic end enhances the hydrophobicity of the slurry and inhibits the transmission of aggressive ions in the gelled slurry, thereby improving the chlorine salt corrosion resistance and crack resistance of the high-strength marine mass concrete.
Compared with the prior art, the invention has the beneficial effects that:
1) According to the invention, the thermal shrinkage induction type anti-cracking fiber and the curing aggregate in the Gao Weixi communicating holes are simultaneously introduced into the high-strength marine large-volume concrete with the carbon number of more than 50, the microstructure of the high-strength marine large-volume concrete is cooperatively regulated and controlled, the anti-cracking performance and the chlorine salt corrosion resistance of the high-strength marine large-volume concrete are improved, and the technical problems of cracking control, chlorine salt corrosion resistance and the like of the high-strength marine large-volume concrete are effectively solved; particularly, hydrophilic micro-internal curing type fibers (submicron cellulose fibers and concrete anti-corrosion inhibitors are further introduced, so that the anti-cracking performance and the anti-chloride ion corrosion performance of the high-strength marine large-volume concrete can be further effectively improved, and the method is suitable for severe chloride salt corrosion environments and the like;
2) The invention utilizes the multi-scale internal curing effect of the internal curing aggregate and the hydrophilic micro-internal curing fiber, combines the temperature shrinkage induction type anti-cracking fiber to apply three-dimensional micro-pre-compression stress, strengthen and toughen the fiber, can comprehensively reduce the dosage of high-strength concrete cementing material and cement, and simultaneously greatly improves the anti-cracking and anti-chlorine salt corrosion performances of the high-strength concrete cementing material and cement;
3) The preparation method is simpler, and the obtained high-strength and high-volume concrete can effectively give consideration to the properties of good mechanical properties, cracking resistance, chlorine salt corrosion resistance and the like, and is suitable for popularization and application.
Detailed Description
The present invention will be described in further detail with reference to the following examples in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
In the following examples, the main material of the core material used is polyester, which is provided by Shanghai Fengmete plasticizing Co Ltd, and has a molecular weight of 25000, a maximum shrinkage of 15%, a response temperature of designable (40-100 ℃), a tensile strength of 400MPa, and an elastic modulus of 12.0GPa;
the main raw material of the adopted skin material is polyformaldehyde, which is provided by Yuntian group Limited liability company, the molecular weight is 28000, the shrinkage rate is 2%, the response temperature can be designed (40-100 ℃), the tensile strength is 800MPa, and the elastic modulus is 20.5GP.
The expansion component adopted in the liquid expansion agent is formed by mixing anhydrous aluminum sulfate and gypsum according to the mass ratio of 1:1; the shrinkage reducing component is amphiphilic diethylene glycol monobutyl ether provided by Jiangsu Bote New Material Co., ltd; the stable dispersion component is cationic polyacrylamide provided by Henan Hongkong chemical industry Co, and the molecular weight of the stable dispersion component is 980 ten thousand.
The cement adopted is P.O42.5 cement provided by Huaxin cement Co., ltd; the fly ash is provided by a Wu Hanyang power plant, the water demand ratio is less than 100%, and the loss on ignition is less than 5%; the mineral powder adopts S95 grade mineral powder provided by Wuxin novel building materials, and the specific surface area is 420m 2 /kg; the sand adopts machine-made sand provided by a certain stone crushing plant of Wuhan, the fineness modulus is 3.2, the MB value is 1.2, and the stone powder content is 7.0%; the broken stone adopts 5-20 mm continuous graded limestone broken stone provided by a certain broken stone factory of Wuhan; the adopted additive is a polycarboxylic acid high-performance water reducer provided by Wuhan Subo novel building material Co.Ltd, the water reducing rate is 28%, and the 28d shrinkage ratio is 105%.
The adopted submicron cellulose fiber is provided by Changzhou market super engineering materials Co., ltd, the equivalent diameter is 10 μm, the tensile strength is 800Mpa, and the average length is 6mm; concrete anti-erosion inhibitor II anti-erosion inhibitor supplied by Jiangsu Bote New Material Co., ltdTIA concrete erosion inhibitor).
The preparation steps of the adopted internal curing aggregate are as follows: weighing and proportioning 50% of phosphogypsum, 10% of sodium hydroxide, 15% of fly ash, 15% of mineral powder and 10% of cement clinker (accurate to 0.01 g), ball milling and mixing for 24 hours by adopting a dry method, sieving with a 300-mesh sieve to obtain mixed powder, adding 10-15% of ionized water for granulating and ageing for 48 hours, preparing a cubic blank with the size of 5mm multiplied by 5mm by adopting a semi-dry compression molding process, and preparing a spherical blank by adopting a full-automatic ball-making machineThe body is dried for 48 hours at 100-105 ℃, then the cube-shaped and spherical blank body is put into a resistance muffle furnace, and the light aggregate is prepared by sintering at 1250 ℃, wherein the specific sintering steps are as follows: firstly heating to 900 ℃ at a speed of 5 ℃/min for 0.6h, wherein the temperature is respectively kept at 200 ℃, 400 ℃, 600 ℃ and 800 ℃ for 0.6h; then heating to the firing temperature at a speed of 3 ℃/min, preserving heat for 2 hours, and cooling to room temperature at a speed of 8 ℃/min; and screening the sintered lightweight aggregate to obtain the particle size (0-2.36 mm); has an apparent density of 1.32g/cm 3 The water absorption rate is 18.0%, the aperture ratio is 38.5%, the compressive strength is 49.0MPa, the barrel pressure strength is 6.5MPa, and the micro-communicated pores with the size of 0.01-100 nm account for 55% of the total porosity.
Examples 1 to 2
The preparation method of the high-strength corrosion-resistant marine large-volume concrete comprises the following steps:
1) Weighing raw materials, wherein the raw materials and the dosage thereof are as follows: cement 315kg/m 3 95kg/m fly ash 3 60kg/m of mineral powder 3 Silica fume 20kg/m 3 Sand 350kg/m 3 1098kg/m of crushed stone 3 150kg/m of water 3 Additive 5.5kg/m 3 Thermal shrinkage induced cracking resistant fiber 2.5kg/m 3 Pre-wet internal curing aggregate 200kg/m 3 ；
The preparation method of the thermal shrinkage induction type anti-cracking fiber comprises the following steps:
the thermal shrinkage induction type anti-cracking fiber adopts two extruders, a polyester-based thermal shrinkage core material mixture and a polyoxymethylene-based thermal shrinkage sheath material mixture are respectively extruded into a die head with two cavities, wherein the thermal shrinkage sheath material mixture enters the cavity corresponding to the sheath material, the thermal shrinkage core material mixture enters the cavity corresponding to the core material, the materials in the two cavities are converged at the position of a spinneret plate of the extruder, wherein the spinneret plate is provided with an inner ring and an outer ring, the inner ring of the spinneret plate is connected with the cavity of the core material, the outer ring of the spinneret plate is connected with the cavity of the sheath material, the two materials in a molten state are extruded through the spinneret plate and are adhered together in air, the materials are cooled through a cold water tank, and then are drawn in hot water at 90-100 ℃ to form the composite fiber with a sheath-core structure, wherein the average diameter of the core fiber 1 is 0.15mm, and the thickness of the sheath fiber 2 is 0.05-0.1 mm;
wherein the mixture of the polyoxymethylene-based heat-shrinkable core material consists of 97.5 weight percent of polyoxymethylene, 1.5 weight percent of maleic anhydride grafting compatilizer (supplied by Dongguan plastic raw materials Co., ltd., model PP-G-MAH) and 1 weight percent of phthalate plasticizer; the extrusion pressure is 8MPa, and the melting temperature is kept at 250 ℃; the polyester-based heat-shrinkable core material mixture consists of 98 weight percent of polyester and 2 weight percent of stiffening nucleating agent (compounded by dibenzylidene sorbitol and sodium benzoate according to the mass ratio of 1:1), the extrusion pressure is 6MPa, and the melting temperature is kept at 210 ℃; in the final extrusion section corresponding to the spinneret plate, the extrusion temperature of the two materials in a molten state is adjusted to 220 ℃, and the extrusion pressure is adjusted to 7MPa; bonding the two materials together in air, cooling by a cold water tank, and then drawing in hot water at 90-100 ℃ to form composite fibers with sheath-core structures, wherein the average diameter of core fibers 1 is 0.15mm, and the thickness of sheath fibers 2 is 0.05-0.1 mm;
adding the obtained composite fiber with the sheath-core structure into a coating pool, wherein the liquid in the coating pool is a commercially available modified KH570 silane coupling agent solution (the adopted solvent is an alcohol water solution, the concentration of ethanol is 5vol percent, and the concentration of the silane coupling agent is 10wt percent), and drying (100-105 ℃ C., 24-48 h) and then carrying out surface indentation treatment;
meanwhile, adding the obtained composite fiber subjected to indentation treatment into a modified polyvinyl alcohol solution added with an expansion component for coating modification (the time is 24 hours), wherein the concentration of the adopted modified polyvinyl alcohol solution is 5%, and the composite fiber is obtained by uniformly mixing the polyvinyl alcohol solution and a liquid expansion agent in a mass ratio of 7:3; coating, modifying, taking out, and drying for 48 hours to obtain the thermal shrinkage induction type anti-cracking fiber; the average diameter is 0.2mm, and the average length is 12mm;
the expansion components and the like on the surface of the obtained thermal shrinkage induction type anti-cracking fiber can be subjected to expansion reaction with concrete after being dissolved, and the free expansion rate of the expansion agent in a closed environment is 0.02%; the bonding strength of the sheath-core fiber and the concrete is more than 20MPa; the shrinkage rate of the obtained composite sheath-core fiber is 0.5-12%, the response temperature is 30-100 ℃, the tensile strength is 700MPa, and the elastic modulus is 15.0GPa.
2) Soaking the internal curing aggregate in water until the internal curing aggregate is saturated with water to obtain saturated water pre-wet internal curing aggregate, adding the saturated water pre-wet internal curing aggregate, cementing materials (cement, fly ash and mineral powder) and aggregates (sand and broken stone) into a concrete mixer, pre-mixing uniformly, pouring water and a water reducing agent, stirring uniformly, and uniformly adding temperature shrinkage induction type anti-cracking fibers, and stirring uniformly; obtaining a mixture;
3) And (3) after the obtained mixture is subjected to die assembly, vibration and molding, covering a waterproof film on the surface, performing film curing, removing the die, and performing hot water curing (example 1) or standard curing (example 2) to obtain the high-strength marine large-volume concrete.
Wherein, standard curing conditions are: curing at 20+/-1 ℃ with relative humidity higher than 90% for 28 days;
the hot water curing conditions are as follows: after concrete is poured and formed, curing is carried out for 24 hours under a standard curing environment, then the concrete is placed in a water bath box, the temperature is raised to 90 ℃ at a speed of 10 ℃/h, the concrete is cured for 12 hours at a constant temperature, then the temperature is lowered to 20 ℃ at a speed of 20 ℃/h, and finally the concrete is placed under the standard curing environment and cured for 28 days.
Examples 3 to 4
The preparation method of the high-strength corrosion-resistant marine large-volume concrete is almost the same as that of the embodiment 1, and the difference is that the adopted formula conditions are as follows: cement 315kg/m 3 95kg/m fly ash 3 60kg/m of mineral powder 3 Silica fume 20kg/m 3 Sand 350kg/m 3 1098kg/m of crushed stone 3 150kg/m of water 3 Additive 5.5kg/m 3 Thermal shrinkage induced cracking resistant fiber 2.5kg/m 3 Pre-wet internal curing aggregate 200kg/m 3 Modified hydrophilic micro-internal curing type fiber 0.5kg/m 3 The method comprises the steps of carrying out a first treatment on the surface of the The concrete of example 3 was cured with hot water and the concrete of example 4 was cured with standard.
The preparation method of the modified hydrophilic micro-internal maintenance type fiber comprises the following steps: immersing the dried submicron cellulose fiber into a concrete anti-corrosion inhibitor, immersing for 48 hours, and then taking out and naturally airing to a saturated surface dry state (no obvious anti-corrosion inhibitor solution exists on the surface of the fiber); the obtained modified hydrophilic micro-internal maintenance type fiberThe adsorption quantity of the concrete anti-corrosion inhibitor is 30kg/m 3 。
Comparative example 1
A high Jiang Hai work mass concrete was prepared in substantially the same manner as in example 1, except that the formulation conditions used were: cement 315kg/m 3 95kg/m fly ash 3 60kg/m of mineral powder 3 Silica fume 20kg/m 3 Sand 702kg/m 3 1098kg/m of crushed stone 3 150kg/m of water 3 Additive 5.5kg/m 3 。
Comparative example 2
A high Jiang Hai work mass concrete was prepared in substantially the same manner as in example 1, except that the formulation conditions used were: cement 315kg/m 3 95kg/m fly ash 3 60kg/m of mineral powder 3 Silica fume 20kg/m 3 Sand 350kg/m 3 1098kg/m of crushed stone 3 150kg/m of water 3 Additive 5.5kg/m 3 Common polypropylene fiber (non-thermal shrinkage) 0.9kg/m 3 Pre-wet internal curing aggregate 200kg/m 3 The method comprises the steps of carrying out a first treatment on the surface of the Wherein, the adopted non-thermal shrinkage common polypropylene fiber (the molecular weight of polypropylene is 8800) is provided by Shandong Xinfuman chemical engineering Co., ltd, the equivalent diameter is 50 μm, the tensile strength is 400MPa, the elastic modulus is 3GPa, and the average fiber length is 12mm.
Comparative example 3
A high Jiang Hai work mass concrete was prepared in substantially the same manner as in example 1, except that the formulation conditions used were: cement 315kg/m 3 95kg/m fly ash 3 60kg/m of mineral powder 3 Silica fume 20kg/m 3 Sand 350kg/m 3 1098kg/m of crushed stone 3 150kg/m of water 3 Additive 5.5kg/m 3 2.5kg/m of common thermal shrinkage type polyester fiber 3 Pre-wet internal curing aggregate 200kg/m 3 The method comprises the steps of carrying out a first treatment on the surface of the Wherein the common heat-shrinkable polyester fiber is provided by China petrochemical instrumentation chemical fiber Limited liability company, and has density of 920kg/m 3 The tensile breaking strength is 80MPa, the initial shrinkage temperature is 80 ℃, the shrinkage rate at 80 ℃ is 1%, and the boiling water shrinkage rate is 8%.
Comparative example 4
A high Jiang Hai work mass concrete was prepared in substantially the same manner as in example 1, except that the formulation conditions used were: cement 315kg/m 3 95kg/m fly ash 3 60kg/m of mineral powder 3 Silica fume 20kg/m 3 Sand 350kg/m 3 1098kg/m of crushed stone 3 135kg/m of water 3 Additive 5.5kg/m 3 2.5kg/m of ordinary heat-shrinkable polyester fiber (same as comparative example 3) 3 Pre-wet internal curing aggregate 200kg/m 3 20kg/m of concrete anti-erosion inhibitor is doped externally 3 。
Comparative example 5
The preparation method of the high-strength corrosion-resistant marine large-volume concrete is almost the same as that of the embodiment 3, and the difference is that the adopted formula conditions are as follows: cement 315kg/m 3 95kg/m fly ash 3 60kg/m of mineral powder 3 Silica fume 20kg/m 3 850kg/m of sand 3 1098kg/m of crushed stone 3 150kg/m of water 3 Additive 5.5kg/m 3 Thermal shrinkage induced cracking resistant fiber 2.5kg/m 3 Modified hydrophilic micro-internal curing type fiber 0.5kg/m 3 。
Comparative example 6
The preparation method of the high-strength corrosion-resistant marine large-volume concrete is almost the same as that of the embodiment 3, and the difference is that the adopted formula conditions are as follows: cement 315kg/m 3 95kg/m fly ash 3 60kg/m of mineral powder 3 Silica fume 20kg/m 3 Sand 350kg/m 3 1098kg/m of crushed stone 3 150kg/m of water 3 Additive 5.5kg/m 3 Pre-wet internal curing aggregate 200kg/m 3 Modified hydrophilic micro-internal curing type fiber 0.5kg/m 3 。
Comparative example 7
The preparation method of the high-strength corrosion-resistant marine large-volume concrete is almost the same as that of the embodiment 1, and the difference is that the adopted formula conditions are as follows: cement 315kg/m 3 95kg/m fly ash 3 60kg/m of mineral powder 3 Silica fume 20kg/m 3 850kg/m of sand 3 1098kg/m of crushed stone 3 150kg/m of water 3 Add inAgent 5.5kg/m 3 Thermal shrinkage induced cracking resistant fiber 2.5kg/m 3 。
Comparative example 8
A high Jiang Hai work mass concrete was prepared in substantially the same manner as in example 1, except that the formulation conditions used were: cement 315kg/m 3 95kg/m fly ash 3 60kg/m of mineral powder 3 Silica fume 20kg/m 3 Sand 350kg/m 3 1098kg/m of crushed stone 3 150kg/m of water 3 Additive 5.5kg/m 3 2.5kg/m of heat-shrinkable composite fiber 3 Pre-wet internal curing aggregate 200kg/m 3 20kg/m of concrete anti-erosion inhibitor is doped externally 3 35kg/m of an external swelling agent 3 The method comprises the steps of carrying out a first treatment on the surface of the The heat-shrinkable composite fiber is basically the same as in example 1, except that the coating modification is performed without adding an expansion component to the modified polyvinyl alcohol solution, and the expansion agent is a type II expansion agent provided by Wuhan three-source special materials Co.
The results of the performance tests of the C55 high-strength concrete obtained in examples 1 to 6 and comparative examples 1 to 8 are shown in Table 1, respectively.
TABLE 1 results of Performance test of C55 high-strength concrete obtained in examples 1 to 4 and comparative examples 1 to 8
In table 1, the working properties of each example and comparative example are substantially identical, and are not described in detail herein.
From the above test results, it can be seen that: under the action of thermal excitation curing, the thermal shrinkage induced anti-cracking fiber and Gao Weixi intercommunicating pore internal curing aggregate has higher compressive strength and splitting tensile strength and better volume stability, and can cooperatively improve the anti-cracking performance and the anti-chlorine salt corrosion performance. After being doped with the submicron cellulose fiber for adsorbing the corrosion ion inhibitor, the concrete can further improve the chlorine salt corrosion resistance and the crack resistance.
The thermal expansion and cold shrinkage type polypropylene fiber which is commonly used for improving the cracking resistance of the concrete is doped, so that the splitting tensile strength of the concrete can be only improved to a limited extent, the cracking resistance level is L-III, the dispersibility is common, and the corrosion resistance of the concrete to chloride salt can not be improved at the same time; the common thermal expansion and contraction polypropylene fiber and the internal curing aggregate are mixed to reduce the shrinkage of the concrete to a certain extent, slightly improve the splitting tensile strength of the concrete, and cannot improve the chlorine salt corrosion resistance of the concrete, wherein the cracking resistance grade is L-III.
Compared with the scheme of mixing common thermal shrinkage type polyester fiber or thermal shrinkage induced cracking resistant fiber without coating expansion components and mixing commercially available expansion agents, the thermal shrinkage induced cracking resistant fiber has better volume stability (micro expansion performance) after being mixed into concrete, and the cracking resistance can be remarkably improved as compared with the scheme of comparing examples 5 and 7.
The thermal shrinkage type polyester fiber is doped, so that the splitting tensile strength of the concrete can be improved, the cracking resistance level is L-III, the dispersibility is common, and the chlorine salt corrosion resistance of the concrete cannot be improved; the thermal shrinkage type polyester fiber can be mixed with the pre-wet internal curing aggregate to reduce the shrinkage of the concrete to a certain extent, slightly improve the splitting tensile strength of the concrete, has an anti-cracking grade of L-IV and cannot improve the chlorine salt corrosion resistance of the concrete; the thermal shrinkage type polyester fiber energy, the internal curing aggregate and the concrete corrosion inhibitor are mixed to reduce the shrinkage of the concrete to a certain extent, improve the corrosion resistance of the concrete to chlorine salt, slightly improve the splitting tensile strength of the concrete, and the cracking resistance of the concrete is L-IV grade, so that the cracking resistance is required to be further improved. The compression strength and the splitting tensile strength of the cured aggregate in the thermal shrinkage induction type anti-cracking fiber and Gao Weixi communicating holes are higher, the volume stability is better (the 28d shrinkage is less than 200 x 10) -6 ) Can cooperatively improve the cracking resistance (the cracking resistance grade reaches L-V grade) and the chlorine salt corrosion resistance (the 28d electric flux is less than 700C). After being doped with the submicron cellulose fiber for adsorbing the corrosion ion inhibitor, the concrete can further improve the chlorine salt corrosion resistance and the crack resistance.
The above examples are presented for clarity of illustration only and are not limiting of the embodiments. Other variations and modifications of the above description will be apparent to those of ordinary skill in the art, and it is not necessary or exhaustive of all embodiments, and thus all obvious variations or modifications that come within the scope of the invention are desired to be protected.
Claims (10)
1. A high-strength corrosion-resistant marine large-volume concrete is characterized by comprising the following components in an admixture of 0.5-50 kg/m 3 Temperature shrinkage induced cracking resistant fiber and 50-800 kg/m 3 Pre-wet internal curing aggregate; the shrinkage rate of the thermal shrinkage induction type anti-cracking fiber is more than or equal to 0.5%, and the thermal excitation shrinkage temperature is 30-100 ℃.
2. The high-strength corrosion-resistant marine bulk concrete according to claim 1, wherein the thermal shrinkage-induced crack-resistant fiber comprises a thermal shrinkage composite fiber composed of a thermal shrinkage core material and an outer thermal shrinkage skin material, and a water-soluble modified polyvinyl alcohol layer further coated on the surface thereof; wherein the water-soluble modified polyvinyl alcohol layer contains polyvinyl alcohol and an expansion component.
3. The high-strength corrosion-resistant marine bulk concrete according to claim 2, wherein the main raw material of the heat-shrinkable core material is one or more of polyester, polypropylene and polyamide, wherein the molecular weight of the polyester is 2-3 ten thousand, the molecular weight of the polypropylene is 6000-8000, the molecular weight of the nylon is 2-3 ten thousand, the shrinkage rate is 5-15%, the response temperature is 40-100 ℃, the tensile strength is 300-500 MPa, and the elastic modulus is 3-12 GPa; the main raw materials of the heat-shrinkable leather are one or more of polyvinyl alcohol, ultra-high modulus polyethylene and polyformaldehyde, wherein the molecular weight of the polyvinyl alcohol is 17-22 ten thousand, the molecular weight of the polyethylene is 100-200 ten thousand, the molecular weight of the polyformaldehyde is 2-3 ten thousand, the tensile strength is 500-1200 MPa, and the elastic modulus is 7-35 GPa; the shrinkage rate is 0.5-2%, and the response temperature is 30-100 ℃.
4. The high-strength corrosion-resistant marine bulk concrete according to claim 3, wherein the raw materials of the heat-shrinkable core material further comprise stiffening nucleating agents; the raw materials of the heat-shrinkable leather also comprise a plasticizer and a compatilizer.
5. The high-strength marine bulk concrete according to claim 2, wherein the thermal shrinkage induced crack resistant fiber is obtained by performing surface modification on a thermal shrinkage composite fiber by adopting a silicon solution or a silane coupling agent solution, drying and then surface indentation, then adding the thermal shrinkage composite fiber into a modified polyvinyl alcohol solution added with an expansion component for coating modification, taking out and drying; the modified polyvinyl alcohol solution consists of a polyvinyl alcohol solution and a liquid expanding agent.
6. The high strength marine bulk concrete of claim 1, wherein said pre-wet internal curing aggregate has a particle size of 0 to 10mm and an apparent density of less than 1.35g cm -3 The water absorption is more than 10%, the aperture ratio is more than 30%, the compressive strength is more than 45.0MPa, the cylinder pressure is more than 6.0MPa, and the micro-communicated pores with the size of 0.01-100 nm account for more than 50% of the total porosity.
7. The high strength marine bulk concrete of claim 1, wherein the components and their contents comprise: 250-450 kg/m of cement 3 50-150 kg/m of fly ash 3 50-150 kg/m of mineral powder 3 Silica fume 0-150 kg/m 3 500-1000 kg/m of sand 3 800-1200 kg/m of crushed stone 3 140-160 kg/m of water 3 4-10 kg/m of additive 3 Temperature shrinkage induction type crack resistant fiber 0.5-50 kg/m 3 50-800 kg/m of pre-wet internal curing aggregate 3 。
8. The high strength marine bulk concrete of claim 1, further incorporating modified hydrophilic micro-internal curing fibers into the high strength marine bulk concrete; the modified hydrophilic micro-internal curing type fiber is obtained by adding the hydrophilic micro-internal curing type fiber into a concrete anti-erosion inhibitor for soaking treatment and drying.
9. The high strength marine bulk concrete of claim 1, wherein the hydrophilic micro-internal curing fibers are submicron cellulose fibers or lignin fibers.
10. The method for preparing high-strength corrosion-resistant marine bulk concrete according to any one of claims 1 to 9, comprising the steps of:
1) Weighing the raw materials according to the proportion of the concrete; the concrete raw materials comprise cementing materials, sand and stone aggregates, internal maintenance aggregates, additives, thermal shrinkage induction type anti-cracking fibers and water;
2) Carrying out water saturation treatment on the internal curing aggregate to obtain a pre-wetted internal curing aggregate; pre-mixing the pre-wet internal curing aggregate, the cementing material and the sand aggregate uniformly, adding water and an additive, stirring uniformly, adding the temperature shrinkage induction type anti-cracking fiber, and stirring uniformly;
3) And (3) after the obtained mixture is subjected to die assembly, vibration and molding, film curing is performed, and standard curing or heating curing is performed after die removal, so that the high-strength marine large-volume concrete is obtained.
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